PNPase Antibody – Rabbit Polyclonal

The protein encoded by this gene belongs to the evolutionary conserved polynucleotide phosphorylase family comprised of phosphate dependent 3'-to-5' exoribonucleases implicated in RNA processing and degradation. This enzyme is predominantly localized in the mitochondrial intermembrane space and is involved in import of RNA to mitochondria. Mutations in this gene have been associated with combined oxidative phosphorylation deficiency-13 and autosomal recessive nonsyndromic deafness-70. Related pseudogenes are found on chromosomes 3 and 7. [provided by RefSeq, Dec 2012]

PNPT1: RNA-binding protein implicated in numerous RNA metabolic processes. Hydrolyzes single-stranded polyribonucleotides processively in the 3'-to-5' direction. Mitochondrial intermembrane factor with RNA-processing exoribonulease activity. Component of the mitochondrial degradosome (mtEXO) complex, that degrades 3' overhang double-stranded RNA with a 3'-to-5' directionality in an ATP-dependent manner. Required for correct processing and polyadenylation of mitochondrial mRNAs. Plays a role as a cytoplasmic RNA import factor that mediates the translocation of small RNA components, like the 5S RNA, the RNA subunit of ribonuclease P and the mitochondrial RNA-processing (MRP) RNA, into the mitochondrial matrix. Plays a role in mitochondrial morphogenesis and respiration; regulates the expression of the electron transport chain (ETC) components at the mRNA and protein levels. In the cytoplasm, shows a 3'-to-5' exoribonuclease mediating mRNA degradation activity; degrades c- myc mRNA upon treatment with IFNB1/IFN-beta, resulting in a growth arrest in melanoma cells. Regulates the stability of specific mature miRNAs in melanoma cells; specifically and selectively degrades miR-221, preferentially. Plays also a role in RNA cell surveillance by cleaning up oxidized RNAs. Binds to the RNA subunit of ribonuclease P, MRP RNA and miR-221 microRNA. Belongs to the polyribonucleotide nucleotidyltransferase family.

Protein type: EC 2.7.7.8; Mitochondrial; RNA-binding; Transferase; Nucleotide Metabolism - pyrimidine; Nucleotide Metabolism - purine

Chromosomal Location of Human Ortholog: 2p15

Cellular Component: mitochondrion; membrane; cytoplasm; mitochondrial intermembrane space

Molecular Function: 3'-5'-exoribonuclease activity; protein binding; miRNA binding; poly(U) binding; polyribonucleotide nucleotidyltransferase activity; poly(rG) binding

Biological Process: regulation of cellular respiration; RNA polyadenylation; RNA catabolic process; mRNA catabolic process; protein homooligomerization; negative regulation of growth

Disease: Deafness, Autosomal Recessive 70; Combined Oxidative Phosphorylation Deficiency 13